、期待与您交流！ ———-
oc当中，使用foundation 当中的框架中的 NSArray 或NSMutableArray 来对对象内容进行排序。NSMutableArray 是可变数组，是NSArray的子类，继承NSArray的所有方法。
下面重点介绍对数组的排序：一 简单排序
返回一个数组，该数组是旧数组的元素经过选择器排序后的新数组。使用如下：数组排序NSArray *array=[NSArray arrayWithObjects:@“1”,@“3”,@“2”];//返回一个排序好的数组，原来数组元素顺序不变NSArray *array2=[array sortedArrayUsingSelector:@selector(compare:)];-（NSComparisonResult）compareStudent:(student *)stu{//先按照姓排序NSCoparisonResult result = [self.lastname compare:stu.lastname];//、、//如果有相同的姓，就比较名字if(result == NSOrederedSame){result = [ self.firstname compare : stu.firstnam];}return result;}-(NSString *)description{[NSString stringWithFormat:@“[%@ %@]”,self.lastname ,self.firstname];NSArray *array = [NSArray arrayWithObjects:stu1,stu2,stu3,stu4,nil];NSArray *array2=[array sortedArrayUSingSelector:@selector(compareStudents:)];二 利用block排序利用block排序NSArray *array2=[array sortedArrayUsingComparator:^NSComparisonResult(Student *obj1, Student *obj2){先按照姓排序NSComparisonResult result = [obj1.lastname compare:obj2.lastname];如果有相同的姓，，就比较名字if(result == NSOrederedSame){result = [ obj1.firstname compare : obj2.firstnam];}return result;}];NSLog(@“array2”,array2);三 高级排序
高级排序
//1.先按照书名进行排序
NSSortDescriptor *bookNameDesc = [NSSortDescriptor
sortDescriptorWithKey:@“book.name”,ascending:YES];
//2.先按照姓进行排序
NSSortDescriptor *lastNameDesc = [NSSortDescriptor
sortDescriptorWithKey:@“lastname”,ascending:YES];
//3.先按照名进行排序
NSSortDescriptor *firstNameDesc = [NSSortDescriptor
sortDescriptorWithKey:@firstname”,ascending:YES];
//按顺序添加排序描述器
NSArray *descs = [NSArray arrayWithObjects:bookNameDesc,lastnameDesc,firstnameDesc,nil];
NSArray *array2 = [array sortedArrayUsingDescriptors:descs];
NSLog(@“array2:%@”,array2);
以下为项目实践，同时使用了普通排序和高级排序功能；定义一个学生类，需要有姓名，年龄，考试成绩三个成员属性，创建5个对象，属性可以任意值。（Objective-C）1) 不使用@property，手动编写他们的访问器方法（getter和setter），注意内存管理（手动管理内存）2) 增加一个便利构造器（快速构造器）3) 使用NSLog输出学生对象时，输出信息格式为：My Name Is XXX Age Is XXX Score Is XXX4) 对5个学生对象按照成绩—》年龄—》姓名优先级排序（成绩相同按照年龄排序，成绩年龄相同按照姓名排序（5个学生的属性值自己随便设定，姓名不考虑中文，按26个大小字母排序））student.h文件：#import <Foundation/Foundation.h>@interface Student : NSObject{NSString * _name;int _age;int _score;}-(void)setName:(NSString*)name;-(void)setAge:(int)age;-(void)setScore:(int)score;-(NSString*)name;-(int)age;-(int)score;-(id)initName:(NSString*)name andAge:(int)age andScore:(int)score;+(id)studentName:(NSString *)name withAge:(int)age withScore:(int)score;-(NSComparisonResult)compareStuden:(Student *)stu;@endstudent.m文件：//// Student.m// PersonStudent//// Created by xiaojunquan on 15/2/5.// Copyright (c) 2015年 xiaojunquan. All rights reserved.//#import "Student.h"@implementation Student-(void)setName:(NSString *)name{if (_name!=name) {[_name release];NSLog(@"%@被释放了",_name);_name=[name retain];}}-(void)setAge:(int)age{_age=age;}-(void)setScore:(int)score{_score=score;}-(NSString *)name{return _name;}-(int)age{return _age;}-(int)score{return _score;}+(id)studentName:(NSString *)name withAge:(int)age withScore:(int)score{Student *student =[[[Student alloc]init]autorelease];student.name=name;student.age=age;student.score=score;return student;}-(id)initName:(NSString *)name andAge:(int)age andScore:(int)score{if (self=[super init]){self.age=age;self.name=name;self.score=score;}return self;}-(NSComparisonResult)compareStuden:(Student *)stu{//将非oc对象（普通数据类型）封装成oc对象NSNumber *score1 =[NSNumber numberWithInt:self.score];NSNumber *score2 =[NSNumber numberWithInt:stu.score];NSNumber *age1 = [NSNumber numberWithInt:self.age];NSNumber *age2 = [NSNumber numberWithInt:stu.age];//这里只能用oc对象来进行比较，不能写成self.score compare: stu.scoreNSComparisonResult result= [score1 compare: score2];if (result==NSOrderedSame) {result = [age1 compare: age2];if (result== NSOrderedSame) {result = [self.name compare:stu.name];}}return result;}-(NSString *)description{ // NSLog(@"My Name is @%,my age is i%,my score is i%",_name,_age,_score); //切记不要写成i% @%NSString *str= [NSStringstringWithFormat:@"My Name is %@ ,my age is %i ,my score is %i" ,self.name, self.age, self.score];return str;}-(void)dealloc{[_name release];NSLog(@"姓名为%@的学生被回收了。。。。",_name);[super dealloc];}@endmain.m文件中：//// main.m// PersonStudent//// Created by xiaojunquan on 15/2/5.// Copyright (c) 2015年 xiaojunquan. All rights reserved.//#import <Foundation/Foundation.h>#import "Student.h"void sortStudent(NSArray *array){//1.按分数从大到小排序NSSortDescriptor *scoreDesc = [NSSortDescriptor sortDescriptorWithKey:@"score" ascending:NO];//2.按年龄从大到小排序NSSortDescriptor *ageDesc = [NSSortDescriptor sortDescriptorWithKey:@"age" ascending:NO];//3.按姓名从小到大排序NSSortDescriptor *nameDesc = [NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES];//4.按顺序填加描述器，用数组保存NSArray *desc = [NSArray arrayWithObjects:scoreDesc,ageDesc,nameDesc, nil];//5.让array 使用描述器来排序数组,因为nsarray是不可变的，所以存放在array2 中。NSArray *array2= [array sortedArrayUsingDescriptors:desc];//6.打印出排序结果NSLog(@"array2:学生对象按照成绩—》年龄—》姓名优先级排序:%@",array2);}int main(int argc, const char * argv[]) {@autoreleasepool {// insert code here…Student* stu1= [[Student alloc]initName:@"JJ" andAge:22 andScore:100];Student* stu2= [[Student alloc]initName:@"YY" andAge:20 andScore:90];Student* stu3= [[Student alloc]initName:@"ff" andAge:20 andScore:90 ];Student* stu4= [[Student alloc]initName:@"dd" andAge:24 andScore:77];Student* stu5= [[Student alloc]initName:@"bb" andAge:20 andScore:95];Student *stu6= [Student studentName:@"anzi" withAge:22 withScore:100 ];stu1.name = @"xiaojunquan";NSArray *array = [NSArray arrayWithObjects:stu1,stu2,stu3,stu4,stu5,stu6, nil];NSArray *array2 =[array sortedArrayUsingSelector:@selector(compareStuden:)];NSLog(@"array2:学生对象按照成绩—》年龄—》姓名优先级排序:%@",array2);NSLog(@" 以下为高级方法排序：");sortStudent(array);[stu5 release];[stu4 release];[stu3 release];[stu2 release];[stu1 release];}return 0;}最后运行结果如下：愚者用肉体监视心灵，智者用心灵监视肉体
